Update augeas.py

Our "own" augeas.py was outdateed. We update it to match
upstream.

Change-Id: If78a333b44ac2441bba685e65938871f652631c6
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
(cherry picked from commit eaeacd9b34ad2aefd40ff31d5e44cd911feaa686)